Grape Plant Named &#39;Crimson Pearl&#39;

ABSTRACT

‘Crimson Pearl’ is a late-budding grape variety notable for its winter hardiness, late bud break in springtime, and suitability as a red wine grape.

Latin name: Vitis interspecific hybrid.

Variety denomination: ‘Crimson Pearl’.

BACKGROUND OF THE VARIETY

‘Crimson Pearl’ is a new and distinct variety of grape plant selectedfrom a group of seedlings resulting from a controlled cross of femaleparent ‘MN 1094’ (not patented) and male parent ‘E.S. 4-7-26’ (notpatented) carried out at Hugo, Minn. in 1996. ‘Crimson Pearl’ wasselected for its excellent winter hardiness, late bud break inspringtime and excellent suitability as a red wine grape. Asexualpropagation by hardwood cutting was first carried out in 2002 at Hugo,Minn.; subsequent asexual propagations have shown the variety to bestable and to reproduce true to type through successive generations.

BRIEF DESCRIPTION OF THE VARIETY

‘Crimson Pearl’ is a late-budding grape variety notable for its winterhardiness, late bud break in springtime, and suitability as a red winegrape.

A comparison of ‘Crimson Pearl’ to its parents is shown in Table 1below.

TABLE 1 ‘Crimson Pearl’ ‘MN 1094’ ‘ES 4-7-26’ Winter hardiness Primarybud Primary bud Primary bud hardiness to -32C hardiness to hardiness toor colder -40C -30C Bud break Later Earlier Earlier Acidity at harvest0.8% 1.2% 1% pH 3.40 3.20 3.25 Berry size 14.78 mm avg. 6 mm 14 mmdiameter Cluster size 110 g 45 g 140 g

A comparison of ‘Crimson Pearl’ to ‘Marquette’ (U.S. Plant Pat. No.19,579), another cold-hardy variety, is shown in Table 2 below.

TABLE 2 ‘Crimson Pearl’ ‘Marquette’ Winter hardiness Very hardy HardyBud break Late April, about 12 days Mid-April after ‘Marquette’ Acidityat harvest Lower -0.8% Higher -1.1% to 1.2% Vigor Less vigorous; fewerlateral More vigorous; more shoots lateral shoots Skin tannins Higherconcentration, Lower concentration, not extractible extractible (proteinbound)

BRIEF DESCRIPTION OF THE PHOTOGRAPHS

The photographs show selected characteristics of a ten-year-old ‘CrimsonPearl’ grape plant grown on its own roots, taken during the 2016 growingseason at Hugo, Minn.

FIG. 1 shows the vine and bark;

FIG. 2 shows a bud at first swell stage;

FIG. 3 shows a young shoot and leaves;

FIG. 4 shows an inflorescence;

FIG. 5 shows leaves and tendrils;

FIG. 6 shows the vine, leaves, young shoots and inflorescences;

FIG. 7 shows a leaf; and

FIG. 8 shows a typical cluster and leaf.

DETAILED BOTANICAL DESCRIPTION OF THE VARIETY

The following-detailed botanical description is based on observationsmade during the 2016 growing season at Hugo, Minn. of ten-year-old vinesgrowing on their own roots. All colors are described according to TheRoyal Horticultural Society Colour Chart (Sixth edition). It should beunderstood that the characteristics described will vary somewhatdepending upon cultural practices and climatic conditions, and will varywith location and season. Quantified measurements are expressed as anaverage of measurements taken from a number of individual plants of thenew variety. The measurements of any individual plant or any group ofplants of the new variety may vary from the stated average.

-   Vine:    -   -   Size.—Vines are medium-sized owing to their moderate vigor.        -   Form.—Procumbent.        -   Vigor.—Moderate.        -   Timing of bud burst.—30 Apr. 2016 (100% first swell stage at            112 DDF 50); approximately 12 days later than Marquette.        -   Productivity.—3 to 4 tons per acre on average soil.        -   Trunk diameter.—3.5 cm at 76 cm above the ground.        -   Bark texture.—Exfoliating.        -   Bark color.—Brown N200B.-   Canes:    -   -   Diameter.—7 mm (measured immediately distal to 4^(th) node).        -   Quantity.—Typical pruning to 30 buds giving rise to 30            canes.        -   Bark color.—Greyed-orange 175A.        -   Bark texture.—Smooth with moderate longitudinal lines.        -   Form.—Slightly flattened in cross section.        -   Node size.—13 mm (measured at 4th node).        -   Internode length.—8 cm (measured between 3^(rd) and 4^(th)            full node).        -   Number of tendrils per node.—Pattern is two consecutive            nodes, each with a single tendril, followed by one or two            consecutive nodes with no tendrils. Tendril thickness 1.2 to            2.0 mm, average 1.6 mm        -   Tendril length.—Natural (uncurled) 14.7 cm; stretched 15.7            cm.        -   Tendril texture.—Smooth.-   Flowers:    -   -   Fertility.—Self-fertile.        -   Date of bloom.—11 Jun. 2016 (approximately 465 degree days F            Base 50 from 100% first swell to 50% caps off).        -   Number of inflorescences per shoot.—3.        -   Numbers of flowers per inflorescence.—200.        -   Length of flower cluster.—11 cm.        -   Pedicel length.—2 mm.        -   Filament length.—4 mm.        -   Filament color.—White N155D.        -   Anther length.—1 mm.        -   Anther color.—Yellow 11B.        -   Pistil length.—2.0 to 2.25 mm.        -   Pistil color.—Green 142A; some pistils show orange-red N34A            to orange-red N346 around the stigma.        -   Flower stem length.—1.8 to 2.0 mm.        -   Flower stem color.—Green 142A with orange-red N34A to            orange-red N34B where stem meets pistil.        -   Flower type.—Hermaphroditic.        -   Stamen color.—White N155D.        -   Stamen length.—4 mm.        -   Stamen quantity.—4 to 6.        -   Cap color.—Green 142A with a splash of orange-red N34A to            orange-red N34B in the center of the cap.-   Young shoots (measured at flowering):    -   -   Openness of the tip.—Slightly open.        -   Density of prostrate hairs on tip.—Medium density,            predominantly follow underside of veins.        -   Anthocyanin coloration of prostrate hairs on tip.—Hairs on            the veins lack coloration; hairs between veins are            red-purple 64B.-   Young Leaf (4th distal leaf at flowering):    -   -   Color of upper side of the blade.—Green 143A.        -   Density of prostrate hairs between main veins on lower side            of blade.—Present but sparse.        -   Density of erect hairs on main veins on lower side of            blade.—Strong, especially along both sides of the vein, but            also quite strong on top of the vein.-   Mature Leaves (measured just before veraison):    -   -   Relative size.—Medium.        -   Length.—14.5 to 19.0 cm, average 16.4 cm.        -   Width.—14.5 to 20.0 cm, average 17.2 cm.        -   Thickness.—0.015 mm to 0.017 mm, average 0.016 mm.        -   Shape.—Circular.        -   Color.—Upper surface — Green group 139, in between 139A and            139B(dark yellowish green and moderate yellowish green).        -   Color.—Lower surface — Yellow-green 144A.        -   Texture.—Upper surface — Hairless between veins and            moderately corrugated; some short semi-prostrate hairs on            veins.        -   Texture.—Lower surface — Hairless between veins and            moderately corrugated; moderate erect hairs on the veins.        -   Number of lobes.—3.        -   Terminal lobe.—Form — Pointed.        -   Petiole color.—Red-purple 59C, with yellow-green 143B            striping; striping is wider and more pronounced at distal            half of petiole.        -   Petiole sinus depth.—1.5 to 4.0 cm, average 2.83 cm.        -   Petiolar sinus shape.—V-shaped.        -   Petiolar sinus.—Relative arrangement of lobes — Very wide            open.        -   Petiole sinus limited by veins?.—Yes.        -   Anthocyanin coloration of main veins on upper side of            blade.—Red until first bifurcation.        -   Petiole length.—5.5 to 9.6 cm, average 7.96 cm.        -   Density of prostrate hairs between main veins on lower side            of blade.—Sparse.        -   Density of erect hairs on main veins on lower side of            blade.—Medium.        -   Length of middle vein.—12.0 to 14.3 cm, average 13.1 cm.        -   Petiole length/length of middle vein.—0.46 to 0.74, average            0.61.        -   Lateral sinus depth.—Left side — 1.7 to 4.7 cm, average 2.84            cm.        -   Lateral sinus depth.—Right side — 1.5 to 4.7 cm, average            2.83 cm.        -   Lateral sinus shape.—Shallow U-shape or V-shape; often            asymmetrical.        -   Relative arrangement of lateral sinus lobes.—Open.        -   Margin.—Teeth shape (noted between N2 and N3) — Mostly            rectilinear; a few convex on both sides, and a few convex on            one side and concave on the other side.        -   Length of teeth.—0.8 to 1.6 cm, average 1.17 cm.        -   Width of teeth.—0.6 to 1.4 cm, average 1.03 cm.        -   Ratio of length/width of teeth.—0.67 to 1.1, average 0.9.-   Mature tendrils (measured after veraison, August 27):    -   -   Quantity.—Pattern is two consecutive nodes, each with a            single tendril, followed by one or two consecutive nodes            with no tendrils.        -   Thickness.—1.1 to 2.0 mm, average 1.55 mm.        -   Length.—Natural (uncurled) 14.7 cm; stretched 15.67 cm.        -   Texture.—Smooth.-   Shoot (measured at flowering):    -   -   Attitude(before tying).—45-60 degrees measured at the base            of the shoot between the shoot and the cane from which it            grew.        -   Color of dorsal side of internode (well            illuminated).—Orange-red N34D overlaid with red-purple 59A            speckle and striping.        -   Color of ventral side of internode (without direct            sunlight).—Yellow-green 143B.        -   Density of erect hairs on internodes.—Medium.        -   Length of tendrils.—18 to 22 cm, stretched out.        -   Thickness of tendril.—1.25 mm (measured just proximal to the            branching).        -   Form of tendril.—With two points of branching, one halfway            up the tendril and the other at the end of one of the first            branches.        -   Texture of tendril.—Ribbed with erect hairs present, but            sparse.        -   Number of consecutive tendrils.—Discontinuous; pattern is 2            consecutive nodes with tendrils followed by 1 or 2 nodes            with no tendril.        -   Color of tendril.—Dominant appearance from top of tendril is            red-purple 59A with some strong yellow-green here and there            on the underside of the tendril.-   Fruit:    -   -   Maturity date.—155 days after bud break, or 2548 Degree Days            F, in Hugo, Minn. (45.1600° N, 92.9933° W).        -   Shape.—Round and slightly flattened (width slightly exceeds            length).        -   Length.—13.37 to 15.7 mm, average 14.39 mm.        -   Width.—13.82 to 15.8 mm, average 14.78 mm.        -   Relative size.—Larger than ‘Petite Pearl’ (not patented);            smaller than ‘Verona’ (USPP application filed concurrently            with this application).        -   Brix.—22 degrees.        -   Skin thickness.—0.47 to 0.58 mm, average 0.52 mm.        -   Skin color.—Blue 103A overlaid with some violet-blue 98A.        -   Flesh color.—White N155C with some anthocyanin streaks.        -   Flesh texture.—Slipskin; gelatinous.        -   Juice production.—16 lbs. (7.26 kg) fruit produces 1 gallon            (3.78 L) finished wine.        -   Anthocyanin coloration.—Some coloration around seeds inside            pulp.        -   Flavor.—Fruity, no labrusca flavor.        -   Seed length.—Average 6.8 mm.        -   Seed width.—Average 3.9 mm.        -   Seed thickness.—2.99 mm.        -   Seed shape.—Pyriform.        -   Seed color.—Grey-brown N199C to N199D.-   Cluster:    -   -   Overall shape.—Cylindrical with a wing often borne on a long            pedicel; slightly loose to compact.        -   Relative size.—Larger than ‘Petite Pearl’; smaller than            ‘Verona’.        -   Weight.—70 to 149 g, average 110 g.        -   Length.—8.0 to 14.5 cm, average 11.2 cm.        -   Width.—4.5 to 8.5, average 7.3 cm.        -   Peduncle length.—4.67 to 6.98 mm, average 5.618 mm.        -   Peduncle thickness.—1.22 to 2.10 mm, average 1.711 mm.        -   Pedicel length.—21 to 33 mm, average 27.69 mm.        -   Pedicel thickness.—2.38 to 3.39 mm, average 2.82 mm.        -   Market use.—Production of red wine.        -   Disease resistance/susceptibility.—High resistance to downy            mildew (Plasmopara viticola) and powdery mildew (Erysiphe            necator (Schw.) Burr.); Good resistance to black rot            (Guignardia bidwellii).

1. I claim a new and distinct grape plant substantially as described and illustrated herein. 